A refractory material used in refractory furnace liners, combustion chambers, baffles and artificial fire logs includes alumina silicate; an additive comprising at least one of silicon carbide, silicon nitride, boron carbide, boron nitride and silicon carbo-nitride; and a binder. One embodiment provides a system of detecting aberrant network behavior behind a network access gateway comprising a processor, a first network interface coupled to the processor, a second network interface coupled to the processor, a storage media accessible by the processor and a set of computer instructions executable by the processor. The inflatable member formed thereby is inflated through a lumen internal to the sheath that has an opening into the interior annular space. The housing of the inner valve is keyed to the outer valve closure, so that movement of the outer valve closure rotates the inner valve housing and closure simultaneously. Specific implementations within a Lightweight Directory Access Protocol server are described.